Hi all,
I have blackface Fender Bassman AB165 amp that I want to modify to get 1975 JGB type tones. I know this is quite a different circuit than the TR AB763, but it's what I have right now. This is a 50 watt amp with nice big transformers so that is good. I have a 1x12 open cab with a JBL D131 that sounds pretty good.
I am not doing these mods myself and have no experience working on amps. My preferred local amp tech is not a specialist with Jerry mods, but he is very skilled. I'm looking for help with communicating to him how to modify this amp properly. I have tried searching this forum and other resources and it seems that much that was available is gone.
Any help, comments, or notes are appreciated. I'm especially looking for how to modify the stock AB763 tone stack to match Jerry's 1972-1974 preamp sound. feel free to DM me.
Here are the modifications notes I have right now:
- Modify the circuit back to an AA865 to correct the weird issues with the bias supply and power amp.
- Modify 'normal' preamp tone stack to sound like an AB763.
○ swap ceramic capacitors for silver mica?
- add a 'mid' control and negative feedback control. Use the second input jacks for the knobs to avoid drilling.
Thanks!
I have blackface Fender Bassman AB165 amp that I want to modify to get 1975 JGB type tones. I know this is quite a different circuit than the TR AB763, but it's what I have right now. This is a 50 watt amp with nice big transformers so that is good. I have a 1x12 open cab with a JBL D131 that sounds pretty good.
I am not doing these mods myself and have no experience working on amps. My preferred local amp tech is not a specialist with Jerry mods, but he is very skilled. I'm looking for help with communicating to him how to modify this amp properly. I have tried searching this forum and other resources and it seems that much that was available is gone.
Any help, comments, or notes are appreciated. I'm especially looking for how to modify the stock AB763 tone stack to match Jerry's 1972-1974 preamp sound. feel free to DM me.
Here are the modifications notes I have right now:
- Modify the circuit back to an AA865 to correct the weird issues with the bias supply and power amp.
- Modify 'normal' preamp tone stack to sound like an AB763.
○ swap ceramic capacitors for silver mica?
- add a 'mid' control and negative feedback control. Use the second input jacks for the knobs to avoid drilling.
Thanks!